Force Analysis of a Self-Tuning Shock Absorber for Above-Knee Prosthesis

Yen-Chieh Mao, Wei-Chih Chang, and I-Huei Chen

Keywords

Biomedical modelling, dynamic modelling, prosthesis, shock absorber

Abstract

Shock absorber designed in the prosthesis is an acceptable solution to reduce the impact force in gaits for an above-knee amputee. A conventional shock absorber consists of a constant-coefficient damper provides a fixed property in different situations, delivering too rigid responses for the biological body during impact loads or extended vibrations during gentle loads. The prior stage of this study proposed a novel shock absorber design for an above-knee prosthesis, capable of automatically and smooth tuning for damping coefficient without any electricity. This paper specifically analyzes the damping force performances for different input forces. Simulation results show a consistent performance of automatic tuning for different loading situations.

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